What is ⌘ Cmd + ↑  Shift + Space keyboard shortcut for?

Popular programs using this shortcut

What this shortcut does in different programs?

1. Visual Studio Code (Mac) - Trigger parameter hints  
2. Final Draft 11 (Mac) - Emoji & symbols  
3. Xcode - Apple reserved  
4. Google Sheets (Mac) - Select all  
5. Microsoft Teams (macOS, desktop) - Go to sharing toolbar  

All programs

All programs using this shortcut, by category.

Note: This page includes variations for Command + Shift + Space
Shift + Command + Space
Command + Shift + Space. Restrict to only Command + Shift + Space.